<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Minimal SVG Download</title>
<meta name="description" content="Minimal, showing SVG rednering and download with Diagram.makeSvg." />
<!-- Copyright 1998-2019 by Northwoods Software Corporation. -->
<meta charset="UTF-8">
<script src="../release/go.js"></script>
<script src="../assets/js/goSamples.js"></script>  <!-- this is only for the GoJS Samples framework -->
<script id="code">
  function init() {
    if (window.goSamples) goSamples();  // init for these samples -- you don't need to call this

    var $ = go.GraphObject.make;  // for conciseness in defining templates

    myDiagram = $(go.Diagram, "myDiagramDiv",  // create a Diagram for the DIV HTML element
                  {
                    initialContentAlignment: go.Spot.Center,  // center the content
                    "undoManager.isEnabled": true  // enable undo & redo
                  });

    // define a simple Node template
    myDiagram.nodeTemplate =
      $(go.Node, "Auto",  // the Shape will go around the TextBlock
        $(go.Shape, "RoundedRectangle", { strokeWidth: 0},
          // Shape.fill is bound to Node.data.color
          new go.Binding("fill", "color")),
        $(go.TextBlock,
          { margin: 8 },  // some room around the text
          // TextBlock.text is bound to Node.data.key
          new go.Binding("text", "key"))
      );

    // but use the default Link template, by not setting Diagram.linkTemplate

    // create the model data that will be represented by Nodes and Links
    myDiagram.model = new go.GraphLinksModel(
    [
      { key: "Alpha", color: "lightblue" },
      { key: "Beta", color: "orange" },
      { key: "Gamma", color: "lightgreen" },
      { key: "Delta", color: "pink" }
    ],
    [
      { from: "Alpha", to: "Beta" },
      { from: "Alpha", to: "Gamma" },
      { from: "Beta", to: "Beta" },
      { from: "Gamma", to: "Delta" },
      { from: "Delta", to: "Alpha" }
    ]);

    document.getElementById("svgButton").addEventListener("click", makeSvg);
  }

  // When the blob is complete, make an anchor tag for it and use the tag to initiate a download
  // Works in:
  // * Chrome
  // * IE11, Edge
  // * Firefox
  function myCallback(blob) {
    var url = window.URL.createObjectURL(blob);
    var filename = "mySVGFile.svg";

    var a = document.createElement("a");
    a.style = "display: none";
    a.href = url;
    a.download = filename;

    // IE 11
    if (window.navigator.msSaveBlob !== undefined) {
      window.navigator.msSaveBlob(blob, filename);
      return;
    }

    document.body.appendChild(a);
    requestAnimationFrame(function() {
      a.click();
      window.URL.revokeObjectURL(url);
      document.body.removeChild(a);
    });
  }

  function makeSvg() {
    var svg = myDiagram.makeSvg({ scale: 1, background: "white" });
    var svgstr = new XMLSerializer().serializeToString(svg);
    var blob = new Blob([svgstr], { type: "image/svg+xml" });
    myCallback(blob);
  }
</script>
</head>
<body onload="init()">
<div id="sample">
  <!-- The DIV for the Diagram needs an explicit size or else we won't see anything.
       This also adds a border to help see the edges of the viewport. -->
  <div id="myDiagramDiv" style="border: solid 1px black; width:400px; height:400px"></div>
  <button id="svgButton">Make SVG and Download</button>
  <p>
    This sample shows how to use <a>Diagram.makeSvg</a> function to render all or part of a diagram
    and to initiate a file download.
  </p>
</div>
</body>
</html>
